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"On some probable causes of a tendency to melanic variation in Lepidoptera of high latitudes;" the Annual Presidential Address to the Yorkshire Naturalists' Union, Doncaster, March 20, 1885.

Our writer spent 30 hours traveling with arctic wolves and gained a new appreciation for these predators of the tundra. Wolves pick at the remains of a muskox. To get this image, photographer ...

The Arctic's iconic narwhal, renowned for its long, spiral tusk, is one of nature's most fascinating creatures. Yet, few have witnessed how these elusive animals use their tusks in the wild.